File:El Salvador 1895 5c Seebeck essay blue pair.jpg
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![File:El Salvador 1895 5c Seebeck essay blue pair.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/El_Salvador_1895_5c_Seebeck_essay_blue_pair.jpg/800px-El_Salvador_1895_5c_Seebeck_essay_blue_pair.jpg?20190613193912)
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